feat: resolve chromecast discovery conflict and add CI/CD workflow

- Update Zeroconf to unicast mode to resolve port 5353 conflict with avahi-daemon
- Make API and Streamlit ports configurable via environment variables (defaults: 8055, 8505)
- Add Gitea Actions workflow for automated Docker builds and registry pushes
- Refactor Chromecast discovery to use modern CastBrowser API

app/utils.py

@@ -16,6 +16,10 @@ CONFIG_DIR.mkdir(parents=True, exist_ok=True)
 THUMBNAILS_DIR.mkdir(parents=True, exist_ok=True)
 VIDEOS_DIR.mkdir(parents=True, exist_ok=True)
 
+# Port configuration
+API_PORT = int(os.getenv("API_PORT", "8055"))
+STREAMLIT_PORT = int(os.getenv("STREAMLIT_PORT", "8505"))
+
 # Logging configuration
 logging.basicConfig(
     level=logging.INFO,